%英文字体类符号
\newcommand{\ii}{\mathrm{i}}
\newcommand{\ee}{\mathrm{e}}
\newcommand{\dd}{\mathrm{d}}
%集合论符号
\newcommand{\RR}{\mathbb{R}}
\newcommand{\CC}{\mathbb{C}}
\newcommand{\ZZ}{\mathbb{Z}}
\newcommand{\QQ}{\mathbb{Q}}
\newcommand{\NN}{\mathbb{N}}
%运算类符号-分析学相关
\newcommand{\id}{\operatorname{id}}
\newcommand{\Ln}{\operatorname{Ln}}
\renewcommand{\Re}{\operatorname{Re}}
\renewcommand{\Im}{\operatorname{Im}}
\newcommand{\Arg}{\operatorname{Arg}}
\renewcommand{\arg}{\operatorname{arg}}
\newcommand{\Res}{\operatorname{Res}}
\newcommand{\grad}{\operatorname{gard}}
\newcommand{\Div}{\operatorname{div}}
\newcommand{\rot}{\operatorname{rot}}
%运算类符号-拓扑学相关
\newcommand{\dist}{\operatorname{dist}}
\newcommand{\diam}{\operatorname{diam}}
\newcommand{\Int}{\operatorname{int}}
\newcommand{\ext}{\operatorname{ext}}
\newcommand{\Bd}{\operatorname{Bd}}
\newcommand{\Cl}{\operatorname{Cl}}
\newcommand{\Vol}{\operatorname{Vol}}
%运算类符号-代数学相关
\newcommand{\Hom}{\operatorname{Hom}}
\newcommand{\ran}{\operatorname{ran}}
\newcommand{\dom}{\operatorname{dom}}
\newcommand{\fld}{\operatorname{fld}}
\newcommand{\lcm}{\operatorname{lcm}}
\renewcommand{\gcd}{\operatorname{gcd}}
\newcommand{\rank}{\operatorname{rank}}
\newcommand{\codim}{\operatorname{codim}}
\newcommand{\Ker}{\operatorname{Ker}}
\newcommand{\tr}{\operatorname{tr}}
\newcommand{\diag}{\operatorname{diag}}
\newcommand{\End}{\operatorname{End}}
\newcommand{\Aut}{\operatorname{Aut}}
\newcommand{\im}{\operatorname{im}}
\renewcommand{\mod}{\operatorname{mod}}
\newcommand{\Inn}{\operatorname{Inn}}
%杂项
\renewcommand{\Res}{\operatorname{Res}}
%简便符号
\newcommand{\RA}{\Rightarrow}
\newcommand{\LRA}{\Leftrightarrow}
%希腊字母
\newcommand{\Beta}{\mathrm{B}}